CN1692633B - Imaging device, focusing method and computer used for the imaging device - Google Patents
Imaging device, focusing method and computer used for the imaging device Download PDFInfo
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- 238000003384 imaging method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 56
- 238000004020 luminiscence type Methods 0.000 claims description 25
- 230000008859 change Effects 0.000 claims description 2
- 238000012790 confirmation Methods 0.000 abstract 1
- 230000006870 function Effects 0.000 description 31
- 238000001514 detection method Methods 0.000 description 11
- 230000007613 environmental effect Effects 0.000 description 8
- 238000003825 pressing Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005286 illumination Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 230000001052 transient effect Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
- G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/671—Focus control based on electronic image sensor signals in combination with active ranging signals, e.g. using light or sound signals emitted toward objects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/672—Focus control based on electronic image sensor signals based on the phase difference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
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Abstract
An image processing circuit/CPU performs AF processing in response to a halfway shutter operation and upon confirmation of a shooting shutter instruction causes the light emitting means in a flash circuit to emit light, and decides the amount of light emitted at shooting time on the basis of the brightness component of an output signal of an imaging element, whereby a subject distance is calculated from the amount of light emitted at shooting time, wherein, when the in-focus decision in the AF processing is negative, an optical lens is moved by a lens drive circuit to the position corresponding to the subject distance which has been acquired on the basis of the amount of light emitted at shooting time and a shooting operation is then performed.
Description
Technical field
The focus method and the program that the present invention relates to imaging device, cooperate this imaging device to use.
Background technology
At present, digital camera and be equipped with automatic focus (AF) mechanism mostly based on the camera of film.Among the autofocus system of these cameras is to differ detection system and contrast detection system being built in, differ detection system and cause that by the difference that detects incident light between the diverse location camera focuses on, contrast detection system becomes maximized that lens location by the contrast that detects the image of catching on CCD or analog and realizes focusing on.In arbitrary AF system, the target that light is very dark makes usually and can not detect correct camera lens position in focus.For this reason, for such shooting environmental, send an auxiliary beam and improve targeted environment.
Even yet in the occasion with above-mentioned auxiliary beam irradiation target, in some cases owing to lack the light amount, therefore becoming to determine correct camera lens position or make the decision that makes mistake in focus.Especially, ignore situation out of focus, the user may be informed mistakenly that camera focuses.That is to say, the user can take pictures and and do not know not realize to focus on.
Supplementary illumination jet device or parts are added can increase cost and to the size and the design dielectric imposed limits of camera in the phase advancer.In addition, during automatic focus, can be subjected to strong illumination and dizzy as the personage of target.
Summary of the invention
Therefore the focus method and the program that an object of the present invention is to provide a kind of imaging device, cooperate this imaging device to use are even they allow the user not lose easy in the use also taking pictures under the shooting environmental of dark under correct state in focus.
In order to realize this purpose, in one aspect of the present invention that claim 1 is narrated, a kind of imaging device, have the mobile device that is used for moving optical system and be used to determine a position that will this optical system be moved to this mobile device and make the determination device that a target is focused that this imaging device comprises: light-emitting device; Light control device, when this light-emitting device is tentatively launched, the suitable light amount of launching by light-emitting device when taking based on the brightness decision of this target; Apart from deriving means,, obtain target range to this target corresponding to object brightness when carrying out the emission of preliminary light by light-emitting device when allowing the suitable light amount of light control device decision; And control device, when determination device can not determine that position that this optical system will be moved to, control this mobile device, so that this optical system is moved to the position of the target range of being obtained corresponding to the distance deriving means.
In the another aspect of the present invention that claim 2 is narrated, this in the imaging device of claim 1 narration obtains target range apart from deriving means based on this suitable light amount that light control device determined.
Claim 3 narrate of the present invention aspect another in, a kind of interior focus method of imaging device with auto-focus function and optical controlling function, auto-focus function determines the position that optical system will be moved to and makes that target is focused, optical controlling function is when carrying out the emission of preliminary light, based on the suitable fluorescent lifetime of the true light of the brightness decision of this target unit when taking, make this luminescence unit only luminous in this suitable fluorescent lifetime when taking then, this method comprises: when the position that this optical system will be moved to can not be determined by auto-focus function, this optical system is moved on to position corresponding to target range, and this target range is corresponding to the brightness of this target when being made luminescence unit carry out preliminary light emission by optical controlling function.
In the another aspect of the present invention that claim 4 is narrated, a kind of computer that cooperates imaging device to use, this imaging device has the decision optical system position that will be moved to and auto-focus function that target is focused, and when carrying out the emission of preliminary light based on the suitable luminous duration of brightness decision luminescence unit when taking of this target, make then this luminescence unit when taking only during this suitable fluorescent lifetime in luminous optical controlling function, wherein, this computer run makes the functional programs of this computer as control device, when this control device can not be determined by auto-focus function in the position that will be moved to when this optical system, this optical system is moved on to that position corresponding to target range, and this target range is corresponding to the brightness of this target when being made luminescence unit carry out preliminary light emission by optical controlling function.
Therefore,, also can move on to this optical system on the position corresponding to target range the object brightness of this target range during corresponding to preliminary light emission even under the shooting environmental of black the position in focus that can not determine optical system.Therefore might be under dark shooting environmental even become also photographic subjects and do not lose easy in the use more clearly.
Claim 5 narrate of the present invention aspect another in, a kind of imaging device, have the mobile device that is used for moving optical system and be used to determine the position that will this optical system be moved to this mobile device and make the determination device that target is focused that this imaging device comprises: light-emitting device; Light control device, when making light-emitting device carry out the emission of preliminary light based on the brightness of this target, when decision is taken by the suitable light amount of light-emitting device emission; Apart from deriving means,, obtain target range to this target corresponding to object brightness when carrying out the emission of preliminary light by light-emitting device when allowing the suitable light amount of light control device decision; And invalidation means, when conforming to a predetermined condition when position that determination device determined and apart from the relation between the position that deriving means obtained, the decision that determination device is made is invalid.
According to another aspect of the present invention that claim 6 is narrated, what the imaging device of claim 5 narration was interior obtains target range apart from deriving means based on this suitable light amount that light control device determined.
Another aspect of the present invention of narrating according to claim 7, the position that invalidation means this optical system that determination device is determined in the imaging devices of claim 5 or 6 narrations will be moved to is invalid, and position change that will this optical system will be moved to when taking becomes the position of the target range of being obtained corresponding to the distance deriving means.
Claim 8 narrate of the present invention aspect another in, the predetermined condition that limits in the imaging devices of claim 5 or 6 narrations is: the target range of the position that will be moved to corresponding to this optical system that determination device determined and apart from the difference between the target range that deriving means obtained less than a predetermined value.
Claim 9 narrate of the present invention aspect another in, a kind of focus method that cooperates imaging device to use, this imaging device has the decision optical system position that will be moved to and makes the auto-focus function that target is focused, and when carrying out the emission of preliminary light based on the suitable luminous duration of brightness decision luminescence unit when taking of this target, make this luminescence unit luminous optical controlling function in this suitable fluorescent lifetime only when taking then, this focus method comprises: make about the target range of the position that will be moved to corresponding to this optical system that auto-focus function determined with corresponding to make luminescence unit carry out the decision whether relation between the target range of preliminary light brightness of this target when launching conforms to a predetermined condition when optical controlling function; And when meeting this predetermined condition, the position that this optical system that auto-focus function is determined will be moved to is invalid.
Claim 10 narrate of the present invention aspect another in, a kind of computer that is located in the imaging device, this imaging device has the decision optical system position that will be moved to and makes the auto-focus function that target is focused, and when carrying out the emission of preliminary light based on the suitable luminous duration of brightness decision luminescence unit when taking of this target, make this luminescence unit luminous optical controlling function in this suitable fluorescent lifetime only when taking then, this computer run is used to carry out following functional programs: make about the target range of the position that will be moved to corresponding to this optical system that auto-focus function determined with corresponding to make luminescence unit carry out the decision whether relation between the target range of preliminary light brightness of this target when launching conforms to a predetermined condition when optical controlling function; And when meeting this predetermined condition, the position that this optical system that auto-focus function is determined will be moved to is invalid.
Therefore, when that position that this optical system has been moved to the position is greatly different in focus, or in focus during the apparent error of position, the user is apprised of this result or optical system is moved in focus near the position.Therefore might be under dark shooting environmental even become also photographic subjects more clearly.
Claim 11 narrate of the present invention aspect another in, a kind of imaging device, have the mobile device that is used for moving optical system and be used to determine a position that will this optical system be moved to this mobile device and make and it is characterized in that this imaging device comprises: light-emitting device by the determination device that target is focused; Light control device, when when light-emitting device is tentatively launched, taking based on the brightness decision of this target by the suitable light amount of light-emitting device emission; Apart from deriving means, when the target range of being undertaken by light-emitting device obtaining when preliminary light is launched corresponding to object brightness to this target; Measurement mechanism is measured in the brightness of taking this target under the wait condition; And control device, the control mobile device makes this optical system be moved to the position of the target range of being obtained corresponding to the distance deriving means, and does not rely on determination device when the brightness of this target that is recorded by measurement mechanism is lower than predetermined value.
Claim 12 narrate of the present invention aspect another in, obtain target range apart from deriving means according to the suitable light quantity that light control device determined in the imaging device of claim 11 narration.
Claim 13 narrate of the present invention aspect another in, a kind of focus method that cooperates imaging device to use, this imaging device has the decision optical system position that will be moved to and makes the auto-focus function that target is focused, and when carrying out the emission of preliminary light based on the suitable luminous duration of brightness decision luminescence unit when taking of this target, make this luminescence unit luminous optical controlling function in this suitable fluorescent lifetime only when taking then, this focus method comprises: measure in the brightness of taking this target under the wait condition; Make the decision that whether is lower than predetermined value about brightness by this measured target of measuring process; And when determination result be that brightness by this measured target of measuring process is when being lower than predetermined value, when taking, this optical system moved on on the position corresponding to target range, this target range is corresponding to the brightness in this target when making light-emitting device carry out the emission of preliminary light, and do not rely on auto-focus function.
Claim 14 narrate of the present invention aspect another in, a kind of computer that is located in the imaging device, this imaging device has the decision optical system position that will be moved to and makes the auto-focus function that target is focused, and when carrying out the emission of preliminary light based on the suitable luminous duration of brightness decision luminescence unit when taking of this target, make this luminescence unit luminous optical controlling function in this suitable fluorescent lifetime only when taking then, this computer run is used to carry out following functional programs: measure in the brightness of taking this target under the wait condition; When the brightness that is determined this target by measurement function is lower than predetermined value, when taking, this optical system moved on on the position corresponding to target range, this target range is corresponding to the brightness in this target when making light-emitting device carry out the emission of preliminary light, and do not rely on auto-focus function.
Therefore, when when take waiting object brightness of biding one's time to be lower than predetermined value, when taking, optical system moved on to correct position in focus near.Therefore might be under dark shooting environmental even become also photographic subjects more clearly.
Brief description of drawings
Fig. 1 is the block diagram according to the imaging device of one aspect of the invention;
Fig. 2 is the operational flowchart of explanation according to first embodiment of the invention;
Fig. 3 is the operational flowchart of explanation according to second embodiment of the invention;
Fig. 4 is the operational flowchart of explanation according to third embodiment of the invention.
Embodiment
Hereinafter will specifically should be used for describing the present invention to Electrofax according to one.
(first embodiment)
Fig. 1 is the block diagram that is used for realizing this Electrofax on the one hand of the present invention.This Electrofax has optical system 1, it comprises the set of lenses that contains a condenser lens, timing generator 3 is used to drive the image-forming component 2 such as CCD, by optical system 1 image is formed on the image-forming component 2, and element circuit 4, it comprises by correlated-double-sampling eliminates the noise in the picture signal of image-forming component 2 output and keeps its CDS, amplify the gain-controlled amplifier (AGC) of this picture signal, and the analog to digital converter (AD) that the enlarged image conversion of signals is become digital signal.
Come condenser lens in the support of optical system 1 with the lens actuating device that is equipped with the AF motor.Lens drive circuit 5 is driving the AF motor is imaged onto the target on the image-forming component 2 along optical axis mobile focusing lens and adjustment image focusing state under the control of image processing circuit/CPU 6.In AE control,, drive image-forming component 2 by timing generator 3, so that its charge storage time is controlled according to shutter pulse from image processing circuit/CPU 6.Thereby realized electronic shutter.
The data image signal that image processing circuit/CPU 6 with various signals and image processing function is exported by element circuit 4 produce vision signal in case on such as the display unit 7 of TFT LCD monitor image-forming component 2 on the captured object image be shown as a complete continuous images.When taking, picture signal is compressed to set up the image file of a given format.Resulting image file deposits the image storage medium 8 such as flash memory in.When the reconstruction of image, the image file of expansion compression shows on display 7 then.
Link on image processing circuit/CPU 6 is operation keys unit 9, memory 10 and the electronic flash circuit 11 that is provided with the various operation keyss that comprise shutter key.Memory 10 is to have by image processing circuit/CPU 6 to control and the program ROM of the handling procedure that data processing is required.In this circuit structure, program ROM has the program that makes image processing circuit/CPU 6 play light control unit, distance acquisition unit and control unit effect.
Flasher circuit 11 is furnished with xenon lamp as luminescence unit.Send flashing light from image processing circuit/CPU 6 to flasher circuit 11 by timing generator 3.Make luminescence unit luminous so that when the output flashing light, only during fixed time interval, launch light.The amount and the luminous duration of the light of luminescence unit emission are proportional.By optical system 1 image that is exposed to the target under the flash of light is captured on the image-forming component 2 image-forming component 2 output image signals.Element circuit 4, stand sampling, amplification and digitlization from the picture signal of image-forming component 2 outputs, be sent to image processing circuit/CPU 6 afterwards.In image processing circuit/CPU 6, after image signal transformation is become monochrome information, calculate the luminous duration when taking.When taking, only during the fixed time interval that calculates, send flashing light to flasher circuit 11.That is to say, carry out photocontrol based on TTL (scioptics).
Memory 10 can be have data, such as a memory of program, and can be rewritten when needed.In addition, subprogram and data can deposit image storage medium 8 in.
Next the operation of Electrofax when taking of configuration like this described with reference to flow chart shown in Figure 2.This flowchart text under dark shooting environmental, the operation during such as the open air selection acquisition mode (screening-mode) that do not have illumination at night.
When partly pressing shutter key (among the step SA1 for being), Electrofax is finished automatic focus based on contrast detection scheme and is handled, lens drive circuit 5 drives the AF motor condenser lens is moved on such position (position in focus) in this scheme, to be decided to be the highest (step SA2) to the radio-frequency component of profile in the image that the contrast of this position is caught on according to image-forming component 2. can handle according to differing the automatic focus that detection scheme carries out here. in the where case in office, can adopt fill-in light. when owing to when not obtaining the position in focus of lens, AF is focused on decision handles as not handling from the light quantity not sufficient of target.
After automatic focus is handled, when the shutter instruction pressing shutter key fully and confirmed to take (among the step SA3 for being), calculate flash light emission duration (the light amount of being launched) (step SA4) when taking by TTL flash of light control and treatment.As an example, calculate the luminous duration (the light amount of being launched) by following mode here.That is to say, utilize T1 and the T2 flash of light in the duration (fluorescent lifetime) and carry out twice preliminary light and launch.Preliminary photoemissive the time, utilize the digital signal (picture signal) that sends from image-forming component 2 via element circuit 4 come in the compute histograms highest brightness value (histogram peak: HisPeakT1, HisPeakT2).Then, utilize peak value HisPeakT1, HisPeakT2, and timing data T1 and T2, use
TestRatio＝(HisPeakT2)/(HisPeakT1)/(T2/T1) …(1)
Calculate the ratio TestRatio that the histogram peak with respect to the variation of duration changes.
In addition, use
SetTime＝T1×(1/TestRatio)×PeakTarget/HisPeakT1 …(2)
Calculate the fluorescent lifetime SetTime when taking, this time allows the histogram peak HisPeakT1 in the first preliminary light emission of duration T 1 to become predetermined target peak PeakTarget.
Flash duration when this value is set to take.
Subsequently, the flash duration during from the shooting that calculates promptly calculates the distance D strobo of this target in the amount of flash, deposit (step SA5) in the buffer then temporarily.When the duration is 1000 milliseconds or the more order of magnitude, because flashgun will launch all available light, therefore usefulness
Dstrobe＝G/F(m) …(3)
Come calculating distance D strobe the F to be set from the guide number G and the aperture of flashing light unit.
For example, when G=7 and F=2.8, distance D strobe=2.5m.Distance to this target needn't be necessarily definite by calculating.For example, can be by measuring the relation curve of duration and distance in advance, form with form is stored the data that record, and that distance that reads from this form corresponding to the launch time (duration) that calculates in the TTL of step SA4 flash of light control and treatment obtains this distance.
Next, if do not consider the existence of fill-in light or do not exist, as the result that automatic focus among the step SA2 is handled, it is sure (among the step SA6 for not) that AF focuses on decision, then in fact carries out shooting operation (step SA8).In this step, the view data of catching with image-forming component 2 is compressed, and is recorded in then on the image storage medium 8.On the other hand, if whether AF focuses on decision (among the step SA6 for being), then condenser lens is moved on to corresponding in the position of that distance that calculates after TTL flash of light control and treatment (step SA7), carry out shooting operation then with record piece image (step SA8).
Therefore according to this embodiment, when not determining position in focus by operating based on the automatic focus that differs, or contrast detection scheme is when being unfavorable for being in target under the dark surrounds, and the focus state by lens being moved to the image that can be taken by the distance of TTL flash of light control and treatment decision (calculating) changes to state in focus from state out of focus.In addition, based on contrast or differ equipment or the parts that do not need to launch fill-in light in the automatic focus operation of detection scheme.So, can reach above-mentioned effectiveness and can not cause the inconvenience that Electrofax is made and reduce its ease for operation.
Calculate general distance with target although among the step SA5 be by the flash duration that is calculated in the TTL flash of light control and treatment, but this is not restrictive. for example, make flasher circuit 11 be configured to adjust the brightness of light-emitting device for those its designs, and in TTL flash of light control and treatment is to calculate flash luminance rather than duration, and the camera of the suitable amount of flash when thereby the brightness that luminescence unit is arranged in the brightness that calculates guarantee taken, can in step SA5, calculate the general distance of target based on the glisten flash intensity that calculates in the control and treatment of TTL.
In addition, in predetermined light quantity preliminary light emission, can be directly from being included in by element circuit 4 monochrome information in the digital signal of exporting from image-forming component 2, promptly calculate this general target range in the brightness of institute's captured object.The relation curve of measurement target brightness in advance and target range also, the data that record by form storage, and in step SA5 reads corresponding to TTL flash of light control and treatment from this form the target range of detected object brightness at preliminary light emission the time.In this case, needn't require as in the present embodiment, to carry out twice preliminary light emission; That is to say, can only carry out once preliminary light emission.Carrying out preliminary photoemissive occasion twice, can be from obtaining target range the detected object brightness for the first time or in for the second time luminous.And the luminous quantity in the time of can be with the emission of preliminary light is consistent and two forms as above-mentioned type are provided.In this case, from these two different forms, obtain two target ranges, average then and obtain general target range twice preliminary light emission back.
(second embodiment)
Next, with reference to the flow chart description second embodiment of the present invention of Fig. 3, Fig. 3 has illustrated the operation of Electrofax when taking.Equally when partly pressing shutter key (step SB1), Electrofax is carried out automatic focus and is handled (step SB2) in this embodiment.When pressing shutter key fully and confirm to take shutter instruction (among the step SB3 for being), flash duration (amount of flash) when calculating shooting by TTL flash of light control and treatment (step SB4), and based on the duration calculating target range that calculates, then with its temporary transient storage (step SB5).Processing among first embodiment of processing and Fig. 2 till this point is identical.Yet in automatic focus was handled, target range was according to being identified in calculating of the automatic focus scheme that adopted.For example, for contrast detection system, the position that this distance is based on condenser lens calculates.
Then, when focusing on decision, the AF in step SB2 automatic focus is handled has or do not exist fill-in light for sure not considering, the absolute value of the difference between the target range that calculates among resulting target range and the step SB5 during but this automatic focus is handled (distance that calculates by TTL flash of light control and treatment) is during greater than a particular value (among the step SB6 for being), thinks that the AF focusing of automatic focus in handling determines mistake.Thereby it is negative from changing into certainly to focus on decision, shows suitable message or mark (step SB7) simultaneously on display 7.After this, carry out photographing process (step SB8).If the decision among the step SB6 shows not, then carries out photographing process (step SB8) as usual.
As mentioned above, when since target be dark and made mistakenly differ or handle based on the automatic focus of contrast in the focusing decision time, when promptly making the decision that has realized focusing on, present embodiment allows to proofread and correct this erroneous decision and informs that also user images does not focus on.Might point out the user to clap again once or artificial focusing thereby become.So, the image of the clear focusing of permission user record.In handling, do not require equipment or the parts that are used to launch fill-in light equally in the present embodiment based on Contrast Detection or the automatic focus that differs scheme.So, can reach above-mentioned effectiveness and can not cause the inconvenience that Electrofax is made and reduce its ease for operation.
The configuration of present embodiment makes when the focusing decision in automatic focus is handled is considered to mistake, shows relevant this result's message or mark on display 7 at step SB7; Yet this is not restrictive.For example, processing in can modify steps SB7 is so that as the result who handles decision as automatic focus, when having the some position cause that condenser lens focuses on, be used as the intermediate distance correcting lens position of target range, or automatically screening-mode is switched to a pattern wherein not carrying out the AF operation, or make the invalid and cancellation photographing process of shooting operation (shutter operation) with shown above-mentioned message or mark.Can also carry out with previously described first embodiment in the identical processing of processing among the step SA7.
Although calculate general target range (step SB5) the flash duration during in a second embodiment equally from the TTL flash of light shooting that control and treatment calculated, also can obtain target range with described those methods as the replacement method among first embodiment.
(the 3rd embodiment)
Next the third embodiment of the present invention will be described.In this embodiment, memory 10 has the program that permission image processing circuit/CPU 6 plays the measuring unit effect.Operation when hereinafter, taking according to the Electrofax of the 3rd embodiment with reference to the flow chart description of Fig. 4.
In this embodiment, when partly pressing shutter key (step SC1), Electrofax drives image-forming component 2, come the brightness of measurement target according to the signal that in element circuit 4, is digitized from image-forming component 2 output back then, and make the brightness that records whether greater than the decision (step SC2) of a particular value.If this brightness that records greater than this particular value (being not among the step SC2), then is provided with the AF sign (step SC3) of expression modular system, execution is handled (step SC4) based on contrast or based on the automatic focus that differs as usual then.On the other hand, if the decision among the step S2 represents it is that the AF sign (step SC5) of expression flash system then is set.
When the shutter instruction pressing shutter key fully and confirmed to be used for taking (step SC6 is for being), calculate flash duration (luminous quantity) (step SC7) when taking by TTL flash of light control and treatment as the situation among first and second embodiment.After this, if the AF sign has been set as modular system (being not among the step SC8), then carry out shooting operation (step SC11) same as before.On the other hand, if this sign has been set as flash system (among the step SC8 for being), then the flash duration that has calculated in based on step SC7 at step SC9 is calculated range-to-go, and condenser lens is moved on to corresponding on that position of the distance that is calculated (step SC10).Carry out shooting operation (step SC11) then.
As mentioned above, according to the 3rd embodiment, when target very dark thereby traditional can not correctly determine whether to have realized focusing on based on contrast or based on the automatic focus scheme that differs the time, the AF system is arranged to based on the system of glistening, and controls the position of condenser lens based on the distance of using the TTL flash function to calculate.Therefore, can improve the accuracy of automatic focus operation under the extremely low shooting environmental of object brightness.In addition, owing to can realize focusing on, therefore can reach above-mentioned effectiveness and can not cause the inconvenience that Electrofax is made and reduce that it is nimble in the extremely black place that is not having fill-in light.
Although calculate general target range (step SC9) the flash duration in the 3rd embodiment during, also can obtain target range with described those methods as the replacement method among first embodiment equally from the TTL flash of light shooting that control and treatment calculated.
Although mainly described embodiments of the invention according to being applied to Electrofax, but the principle of the invention also can be applicable to the camera based on film, if this camera has based on contrast detection system or differs the auto-focus function of system and the optical controlling function of amount of flash when taking by TTL system control.
Claims (6)
1. imaging device comprises being used for determining and will one condenser lens of optical system being moved to a position with a mobile device, thereby makes the control unit (6) that a target is focused, and it is characterized in that this imaging device comprises:
Light-emitting device (11);
This control unit (6) also comprises:
Light control device, when making light-emitting device carry out the emission of preliminary light based on the brightness of this target, when decision is taken by the suitable light amount of light-emitting device emission;
Apart from deriving means,, obtain target range to this target corresponding to object brightness when carrying out the emission of preliminary light by light-emitting device when determining suitable light amount; And
Be used to judge the device that whether conforms to a predetermined condition between the position that position that the described condenser lens that determined will move to and this obtain apart from deriving means;
Invalidation means when the relation between position that is determined and the position that obtained conforms to a predetermined condition, makes the position that is determined invalid.
2. according to the imaging device of claim 1, it is characterized in that obtaining target range based on this suitable light amount that light control device determined apart from deriving means.
3. according to the imaging device of claim 1 or 2, it is characterized in that the position that this invalidation means will be moved to this condenser lens of being determined is invalid, and position change that will this condenser lens will be moved to when taking becomes the position corresponding to the target range of being obtained.
4. according to the imaging device of claim 1 or 2, it is characterized in that this predetermined condition is: the target range of the position that will be moved to corresponding to this condenser lens that is determined and apart from the difference between the target range that deriving means obtained less than a predetermined value.
5. focus method that is used for imaging device, this imaging device has the position that the condenser lens of decision in the optical system will be moved to and makes the auto-focus function that target is focused, and when carrying out the emission of preliminary light based on the suitable luminous duration of brightness decision luminescence unit when taking of this target, make this luminescence unit luminous optical controlling function in this suitable fluorescent lifetime only when taking then, this focus method comprises:
Make the decision that whether conforms to a predetermined condition about the relation between the target range of the target range of the position that will be moved to and the brightness of this target when making luminescence unit carry out preliminary light emission when optical controlling function corresponding to this condenser lens that auto-focus function determined; And
When meeting this predetermined condition, the position that this condenser lens that auto-focus function is determined will be moved to is invalid;
Wherein said target range is determined by the distance acquisition methods, this comprises the relation of measuring in advance between duration and the distance apart from acquisition methods, store measured data with form, and from this form, read distance corresponding to the launch time that in TTL flash of light control and treatment, calculates.
6. computer that is used for imaging device has:
Be used for determining the position that the condenser lens of optical system will be moved to and make the device that target is focused, and
Be used for when carrying out the emission of preliminary light based on the suitable fluorescent lifetime of brightness decision luminescence unit when taking of this target, make this luminescence unit luminous device in this suitable fluorescent lifetime only when taking then,
This computer also comprises:
Be used to make the device of the decision that whether conforms to a predetermined condition about the relation between the target range of the target range of the position that will be moved to and the brightness of this target when carrying out preliminary light emission when luminescence unit corresponding to this condenser lens that is determined; And
When meeting this predetermined condition, the invalid device in position that is used to make this condenser lens of being determined to be moved to.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP378833/2002 | 2002-12-27 | ||
| JP2002378833A JP2004212431A (en) | 2002-12-27 | 2002-12-27 | Autofocus apparatus and autofocus method |
| PCT/JP2003/017029 WO2004062271A1 (en) | 2002-12-27 | 2003-12-26 | Imaging device, focusing method and program |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1692633A CN1692633A (en) | 2005-11-02 |
| CN1692633B true CN1692633B (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2003801004315A Expired - Fee Related CN1692633B (en) | 2002-12-27 | 2003-12-26 | Imaging device, focusing method and computer used for the imaging device |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US20050052566A1 (en) |
| EP (1) | EP1479225A1 (en) |
| JP (1) | JP2004212431A (en) |
| KR (1) | KR100598569B1 (en) |
| CN (1) | CN1692633B (en) |
| AU (1) | AU2003291770A1 (en) |
| TW (1) | TWI258609B (en) |
| WO (1) | WO2004062271A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI258609B (en) | 2006-07-21 |
| AU2003291770A1 (en) | 2004-07-29 |
| US8102462B2 (en) | 2012-01-24 |
| KR20050000402A (en) | 2005-01-03 |
| CN1692633A (en) | 2005-11-02 |
| TW200416422A (en) | 2004-09-01 |
| US20100247084A1 (en) | 2010-09-30 |
| US20050052566A1 (en) | 2005-03-10 |
| EP1479225A1 (en) | 2004-11-24 |
| KR100598569B1 (en) | 2006-07-13 |
| WO2004062271A1 (en) | 2004-07-22 |
| JP2004212431A (en) | 2004-07-29 |
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